Malicious PDF — malware analysis report

Static analysis result for SHA-256 56971f8d8fa72565…

MALICIOUS

PDF

68.2 KB Created: 2021-10-02 15:12:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: af859816e9b68e788cfef86e46d404fa SHA-1: 075953acaf6a14413e3c78b791a54dd8b37d7177 SHA-256: 56971f8d8fa725659b63e5f361cb6e0a3f77a4a2ba4b55699ee270689d5d3e74
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, including a link farm on disposable hosting and compromised WordPress upload storage. These elements suggest the PDF is designed to exploit vulnerabilities or trick the user into downloading a second-stage payload. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://drafthe.ru/uplcv?utm_term=residential+tenancy+agreement+form PDF link annotation
    • http://www.miyadenthai.com/image/upload/File/7779008648.pdfIn PDF document text
    • http://proxima-design.cz/files/file/faxeludomasakan.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16151c5186b084---65652018904.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/rasomelezulebe.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/losajemofuwov.pdfIn PDF document text
    • http://tw-echen.com/uploads/files/202109221248354705.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/46931935003.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/c3f0c405987c94fc01270b520f172c1b/84983133087.pdfIn PDF document text
    • https://e-midas.ro/files/file/83895213808.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/98305499990.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/xuzajofezetikedaz.pdfIn PDF document text
    • http://mebco.ru/images/file/soguwukoluzusibijidosud.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b64b17431---3795377224.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021090418103068.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/72657689360.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/0a189af3b45604827495180c29bcbcab/kebeka.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/mifixuxifinuzago.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/wowone.pdfIn PDF document text
    • http://fs-select.com/images/blog/file/35130602677.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/23084744459.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/falazaxubi.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/72989276575.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ad31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD31 14684 bytes
SHA-256: 6832fd8bf40af6540df823555d7d530834f2d8bd39bde15f6dab459dcc9434bf
font_01_sfnt_off0000d1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F0 10980 bytes
SHA-256: bb65ff3584ce78777079e27b02b1ba9a5721cf1759ccfec2b63961f6d0fe68be
font_02_sfnt_off0000eb46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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